Unlock Round 2 to access Celebi as a rental Pokemon in the Prime Cup competition.
Farfetch'd with Baton Pass move
Win the Rival Cup to get a Farfetch'd that knows the Baton Pass move.
Gligar with Earthquake move
Win the Rival Cup in Round 2 to get a Gligar that knows the Earthquake move.
Alternate title screen
Win all the Stadium Cups in Round 1 to have more Pokemon appear at the title screen. Win all the Stadium Cups in Round 2 for another variation.
Doduo and Dodrio modes
Defeat all the Gym Leader Castle trainers or win all Stadium Cups in Round One to get the Doduo sticker for GB Tower and play Pokemon Gold or Silver faster. Defeat all the Gym Leader Castle trainers or Stadium Cups in Round Two to get the Dodrio sticker for GB Tower and play Pokemon Gold or Silver at the fastest speeds.
Win all the Stadium Cups and defeat all the Gym Leader Castle trainers to unlock the Rival Cup competition.
Super Hard mini-game difficulty
Defeat the CPU in a seven-coin mini-game under the hard difficulty setting.
Tower speed increase
Inside stadium mode, win all cups, or, defeat either Gym Leader Castle in Round 1 to unlock the Doduo sticker for the GB Tower, allowing you to play Pokémon Gold/Silver at double speed. Win all cups or defeat the Gym Leader Castle in Round 2 to unlock the Dodrio GB Tower, allowing you to play Pokémon Gold/Silver at hyper speed.
Get More Knowledge at Pokémon Academy
Once you have finished all the classes and passed all of the tests and won the school battles (beating the Elite Class), more information will be available at the Library, including all Items available in all of the Gameboy Pokémon games.
Use Lugia, Mewtwo and Ho-Oh
If you use a tranfser pak you may can use LUGIA,MEWTWO and HO-OH in battle you CAN'T choose them on another thing.
Alternate Pokemon colors
Name your Pokemon with reversed name or one that includes part of their original name. For example, Two-mew for Mewtwo or Buzzy for Electabuzz. They will have a different tint or color.
Go to the Gym Leader Castle and go directly to the Elite Four. After you defeat Lance and can fight your rival, press B to leave the Gym Leader Castle. Go to the Prime Cup and win in Master Ball. Go back to the Gym Leader Castle and defeat your rival. You will now be able to use Togepi as a rental Pokemon.
The Light Ball doubles Pikachu's Special Attack. You can get this by removing the items from Pikachu from Pokemon Yellow.
Unlimited Mystery Gifts
Note: This trick requires a Transfer Pak and Pokemon Gold or Silver. Make sure your Pokemon Gold or Silver game is saved at a Pokemon Center. Go to the Mystery Gift option. Use Mystery Gift. Go to Game Boy Tower. Use the "Set time" trick and use your password to change the time in Pokemon Gold or Silver. Change the time one day forward. Go back to Mystery Gift on Pokemon Stadium 2 and use it. Repeat this until you get the items you want.
Better Mystery Gifts
Do the Mystery Gift option at about the same time each day. For example, do it at 10:30 a.m. every day. You are more likely to receive items such as the Scope Lens and items for your room.
Defeat the Elite Four in the Johto Gym Leader Castle. You have to win the Castle with a team of your own, with no rentals or registered Pokemon. When you win you will be able to teach one Pokemon on your team a past move that they forgot or never learned. That is how you can get Pokemon such as Mewtwo to learn Confusion, or Zapdos to learn Peck. You can do this as many times as needed.
More Pokemon in Mini-Games
If you have a transfer pak, then this is a great cheat. Put in any pokemon game and follow instructions below.
If you have a Girafarig, go to mini-games. Play Furret's Frolic. You can play as your Girafarig.
If you have an Omanyte, it can replace Togepi in Tumbling Togepi.
If you have Pokemon Yellow, You can be you Pikachu in Pichu's Powerplant.
Hint: Don't evolve the pokemon! You cant use it in your mini-games! There may be more, but you'll have to find them out! Good luck!